A Missoula Guided Fly Fishing Trip Frequently Asked Questions What rivers do you guide? Grizzly Hackle guides on the Clarkfork, Blackfoot, Bitterroot, and Missouri Rivers. We also guide on a few tributaries on our wade fishing trips. For more information on our Missoula guided fly fishing trips, check out our guided trips page. What is Missoula like? Missoula is a town of just over 70,000 people. In Montana, that’s a big city! Although, Missoula has a good size population…